from tkinter import *
coords=[0,0,10,0,10,10,20,10,20,20,0,20]
root=Tk()
root.title("ИТ марафон")
root.geometry("500x500")
canvas=Canvas(bg="white",width=500, height="500")
canvas.pack(anchor=CENTER, expand=1)
canvas.create_polygon(coords)
root.mainloop()

